tính bằng hai cách (2/3×4/5)×5/6

Đáp án:

`a)` `93/40`

`b)` `9/10`

Giải thích các bước giải:

`a)` `4/5÷2/3+3/4÷2/3`

`C1:`

`4/5÷2/3+3/4÷2/3`

`=4/5×3/2+3/4×3/2`

`=6/5+9/8`

`=93/40`

`C2:`

`4/5÷2/3+3/4÷2/3`

`=4/5×3/2+3/4×3/2`

`=(4/5+3/4)×3/2`

`=31/20×3/2`

`=93/40`

-

`b)` `7/3×3/5-5/6×3/5`

`C1:`

`7/3×3/5-5/6×3/5`

`=7/5-1/2`

`=9/10`

`C2:`

`7/3×3/5-5/6×3/5`

`=(7/3-5/6)×3/5`

`=3/2×3/5`

`=9/10`

Đáp án:

Giải thích các bước giải:

a)4/5:2/3+3/4:2/3

c1 : 4/5*3/2 + 3/ 4 * 3/2

= 6/5 +9/8

= 93/ 4

c2 : 4/5:2/3+3/4:2/3

= 2/3 . ( 4/5 +3/4 )

= 2/3 . 31/20

= 93 / 4

b)7/3×3/5-5/6×3/5

c1=7/5-1/2

= 9/10

c2=7/3×3/5-5/6×3/5

=3/5 . (7/3 5/6 )

=3/5 . 3/2

=9/10